What’s the best way to grow grass in sandy soil?

If it is too sandy then it probably drains too well, and would need constant feeding. Grass doesn't grow well in shade especially under trees...........

It's moss, not mold. Chances are that if there is only moss growing there it is because there isn't enough sunlight for grass. Sandy soil probably is not the issue since my grass in Michigan grew great in soil that was so sandy it would wear lawn mower blades away. Moss can be beautiful stuff and I encourage it to grow in the shadier portions of my yard. Never need the lawn mower except for the occasional weed. You may even consider introducing new varieties of moss. Check out mossacres.com.

Please consider an internet personalized inquiry by our local Virgina experts.

I had specific questions answered by master gardeners and even a Professor and Extension Turfgrass Specialist Dept. of Crop and Soil Environmental Sciences Virginia Tech Turf and Garden.

This great resource that I have used and most highly recommend .....is your local Cooperative extension. These offices are manned by a wonderful team of master gardeners that know your local situation quite well Or redirect to the subject experts. There's also email ( submit a photo) Q&A resources that have helped my concerns and questions many times. Consider googling up your local extensions office.

Do an internet search ask garden expert and your state ———you'll find.......

”Fill out the Ask an Expert form below to submit your question. An Extension Master Gardener will reply via email within 48 hours. Please provide as much relevant detail as possible. If you attach photos, please ...”

Additionally Heres a turf link

Best wishes in your gardening adventures

Tips: www.anr.ext.vt.edu/lawnandgarden/turfandgardentips/

https://www.lawnstarter.com/blog/grass-guides/the-4-best-grass-types-for-sandy-soils-virginia-beach-va/